Thermodynamic properties of organic iodine compounds

Richard, Laurent; Gaona, Xavier

doi:10.1016/j.gca.2011.07.030

Cited by 10 publications

(6 citation statements)

References 137 publications

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“…I values and I/Cl molar ratios in the Mengye potash deposit are from 0.07 to 0.27 ppm, and from 0.03 to 0.11 μmol/mol, respectively (Table 3). These values are lower than those found in modern seawater, oil-field brines, hydrothermal brines and formation waters (Worden, 1996;Richard and Gaona, 2011;Wu et al, 2012). There is no relation between iodine concentrations and Cl (Fig.…”

Section: Variation Of Br I Br/cl and I/cl In Halitementioning

confidence: 61%

The origins of the Mengye potash deposit in the Lanping–Simao Basin, Yunnan Province, Western China

Yan

Wang

et al. 2015

Ore Geology Reviews

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Section: Variation Of Br I Br/cl and I/cl In Halitementioning

confidence: 61%

The origins of the Mengye potash deposit in the Lanping–Simao Basin, Yunnan Province, Western China

Yan

Wang

et al. 2015

Ore Geology Reviews

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“…The uptake of iodine by organic matter cannot occur under anoxic conditions, for which essentially all the iodine is present in the iodide form (Richard and Goana, 2011). The measurements for granitic rocks at the Tono site showed that groundwater is in reducing conditions (Iwatsuki et al, 2005).…”

Section: Iodine Chemistry In Watermentioning

confidence: 98%

Effects of depth on transport of 129I in crystalline rock

Oruçoğlu

Akker

Ahn

2014

Annals of Nuclear Energy

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a b s t r a c tIn the present paper, a model for the transport of iodine through fractures in granitic rock has been developed by taking into account the variation of parameters with depth in order to investigate the effects of depth on repository performance. First, the evolution of groundwater chemistry with depth has been modeled by considering the physical and chemical conditions that vary with depth. Second, iodine-water interactions and iodine-rock interactions under groundwater-chemistry evolution with depth in crystalline rocks have been modeled using PHREEQC, with which the distribution coefficients of iodine have been numerically evaluated as a function of depth. These values and other depth-dependent parameters such as fracture aperture, groundwater velocity, and diffusion coefficients have been used in the iodine transport simulation to observe differences in the iodine concentration in the water from repositories located at 500 and 1000 m depths. The results show that iodine stays within the vicinity of the repository if it is disposed of at a greater depth. The main reason is that the retention effect of matrix diffusion increases and relative contribution of advection along fractures decreases at depth due to the cubic law for the water flow velocity in fractures.

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“…The distribution of iodine species depended on the total concentration of iodine (Richard and Gaona 2011;Schmitz 2004;Sebok-Nagy and Kortvelyesi 2004). Because of the concentrations used in their experiments, the effect of the total iodine concentration needed to be taken into account when interpreting the results from Lieser et al…”

Section: Plant Experience -Dissolver and Dissolver Off-gasmentioning

confidence: 99%

Iodine Pathways and Off-Gas Stream Characteristics for Aqueous Reprocessing Plants ? A Literature Survey and Assessment

Jubin¹,

Strachan²,

Soelberg³

2013

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Used nuclear fuel is currently being reprocessed in only a few countries, notably France, England, Japan, and Russia. The need to control emissions of the gaseous radionuclides to the air during nuclear fuel reprocessing has already been reported for the entire plant. But since the gaseous radionuclides can partition to various different reprocessing off-gas streams, for example, from the head end, dissolver, vessel, cell, and melter, an understanding of each of these streams is critical. These off-gas streams have different flow rates and compositions and could have different gaseous radionuclide control requirements, depending on how the gaseous radionuclides partition. This report reviews the available literature to summarize specific engineering data on the flow rates, forms of the volatile radionuclides in off-gas streams, distributions of these radionuclides in these streams, and temperatures of these streams. This document contains an extensive bibliography of the information contained in the open literature.Iodine removal has always been primarily focused on the head-end off-gas operations. But, in light of the estimated iodine emissions control efficiencies of up to 99.9% or higher needed to meet US regulatory requirements, the control of iodine in the dissolver off-gas is insufficient. Operating experience and tests with actual nuclear fuel show that iodine evolution from the dissolver solution into the dissolver off-gas ranges between 95 and 99%. Iodine evolution from the dissolver solution can be improved to >95% with NO 2 sparging, addition of KIO 3 to the dissolver, and addition of iodate. Several studies have shown that much of the residual iodine in the dissolver solution is in the form of colloidal iodine (AgI and PdI 2 ); organic iodides formed in the dissolver also factor into the iodine retention. Even if the iodine in the dissolver off-gas is efficiently controlled, the iodine in other reprocessing facility off-gas streams may also need to be controlled.

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Thermodynamic properties of organic iodine compounds

Cited by 10 publications

References 137 publications

The origins of the Mengye potash deposit in the Lanping–Simao Basin, Yunnan Province, Western China

The origins of the Mengye potash deposit in the Lanping–Simao Basin, Yunnan Province, Western China

Effects of depth on transport of 129I in crystalline rock

Iodine Pathways and Off-Gas Stream Characteristics for Aqueous Reprocessing Plants ? A Literature Survey and Assessment

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